$F713/63251: Output I/O Error Messages: 'ILLEGAL DEVICE NUMBER'
Jump from $F390, $F4AF, $F536, $F53E, $F5F1, $F65C:
F713: A9 09 LDA #$09
F715: 48 PHA
F716: 20 CC FF JSR $FFCC ; Restore I/O Vector
F719: A0 00 LDY #$00
F71B: 24 9D BIT $9D ; Error-Mode-Flag
F71D: 50 0A BVC $F729
F71F: 20 2F F1 JSR $F12F ; Print Message
F722: 68 PLA
F723: 48 PHA
F724: 09 30 ORA #$30
F726: 20 D2 FF JSR $FFD2 ; Output Vector, chrout
Jump from $F71D:
F729: 68 PLA
F72A: 38 SEC
F72B: 60 RTS
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